Bob-sleigh



(No Model.)

0. W. ORESAP.

BOB SLEIGH.

No. 406,028. Patented July 2, 1889.

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UNITED STATES CHARLES IV. CRESAP, OF EYOTA, MINNESOTA.

PATENT OFFICE.

BOB-SL EIGH.

SPECIFICATION forming part of Letters Patent No. 406,028, dated July 2, 1889.

(No model.)

To aZZ 2072,0122, it may concern.-

Be it known that I, CHARLES \V. CRESAP, of Eyota, in the county of Olmsted and State of Minnesota, have invented certain new and useful Improvements in Oscillating Bob- Sleigh Knees, of which the following is a specification.

The object of my invention is to provide an oscillating sleigh-knee in which the oscillation is in or upon the runner; and it consists, generally, in the construction and combination hereinafter described, and particularly pointed out in the claims.

In devices of this class the lower and nearer to the bottom of the runner the oscillating point can be placed the less resistance is offered to the oscillating of the runner it meets with obstructions. Conversely, the higher the oscillating point is placed the longer the leverage from the bottom of the runner and the greater resistance to the oscillation of the runner, since the cross-beam and its load must be carried forward or backward in the movement, and thus strain and twist the frame-work.

The object of my improvement is to place the oscillating point as low as is practicable in or upon the runner and not impair the strength of the parts, and to make a simple, cheap, and durable knee.

In the drawings forming a part of this s peeification, Figure 1 is a side elevation of my improved sleigh-knee as secured to the run ner and cross-train. Figs. 2, 3, and 4c are detail longitudinal sections of the same. Fig. 5 is a detail cross-section.

In the drawings, 1 is a saddle, preferably of malleable cast-iron, bolted to the runner 3. It is provided with flanges 4, which embrace the top of the runner and secure it firmly thereon. It is also preferably provided with the tenon 5, cast solid with it and fits into a mortise in the runner and also with the tenon 6, cast solid with it, which is tapered to a point at the top, as shown in the drawings.

Firmly secured to the cross-beam 11 is the post 9, preferably a malleable casting, pro vided with flanges to grasp the beam, to which it is bolted in the same manner in which the saddle 1 is secured to the runner. The post- 9 is provided with the mortise 7, preferably narrowing upward, into which the tenon 6 enters. The castings 1 and 9 are joined together by means of the pin 13, passing through the post 9 and the tenons 0.

The tenon 0 is slightly thinner than the width of the mortise, so that it can move latorally in the mortise, turning on the pin 13 as an axis, until the tapered edge meets the edge of the mortise, as shown in Figs. 3 and I. This allows a free oscillating movement of the runners in a substantially vertical plane, to adapt it to pass over obstructions freely without undue strain of parts.

In order to prevent wear upon the pin 13 and to secure a strong connection and support upon the runner, I prefer to make the bottom of the post 9 of cylindrical form 10, the curvature of which corresponds to that of a cylinder whose axis would be the pin 13, and the top of the saddle 1 has an open bearing to receive it, thus forming a knuckle joint combined with a cylindrical bearing.

\Vhile I have shown and described a tenon extending downward into the runner, this may be dispensed with and the saddle secured to the runner simply by the flanges and bolts. The knuckle-joint or oscillating bearing may also, if desired, be arranged lower and even in the runner by recessing the top of the runner to receive the saddle. By this means I obtain a very strong and durable joint, with few parts and with the motion upon the runner instead of upon the beam, as is sometimes done.

I claim as my invention-- 1. The combination, with the runner of a bob-sleigh, of the saddle 1, provided with the flanges a and the tenon, the post 9, secured to the beam 11 and provided with the tapering mortise 7, adapted to receive the tenons G and having its bottom of cylindrical form to fit into and turn in the saddle 1, substantially as described.

2. An oscillating bob-sleigh knee comprising, in combination, the post 9, secured to the cross-beam of the sleigh, and the saddle 1, secured to the runner, said post and saddle being connected together by a knuckle-joint and cylindrical bearing at the runner, allowing an oscillating movement of the runner in a substantially vertical plane.

In testimony whereof I have hereunto set my hand this 4th day of February, 1889.

CHARLES WV. ORESAP.

In presence of- CHAS. WV. PARROTT, RICHARD PAUL. 

